Geodesic
Evolution of Sets Systems and Homotopy Groups of Spheres
Mathematics and Education in Mathematics, Tome 41 (2012) no. 1, pp. 202-206.

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Evolution of systems of sets on the Euclidean sphere S^n is investigated. The relationship of such models with homotopy groups of spheres is established. Some combinatorial applications for polytopes are obtained. *2000 Mathematics Subject Classification: Primary 55Q40, 52B11, 05B30.
Keywords: Area-Distance, Systems of Sets, Homotopy Groups of Spheres 
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Stefanov, Simeon; Dragieva, Velika. Evolution of Sets Systems and Homotopy Groups of Spheres. Mathematics and Education in Mathematics, Tome 41 (2012) no. 1, pp. 202-206. http://geodesic.mathdoc.fr/item/MEM_2012_41_1_a20/